142381897 has 6 divisors (see below), whose sum is σ = 165627978. Its totient is φ = 122041584.

The previous prime is 142381861. The next prime is 142381931. The reversal of 142381897 is 798183241.

It can be written as a sum of positive squares in only one way, i.e., 103306896 + 39075001 = 10164^2 + 6251^2 .

It is a de Polignac number, because none of the positive numbers 2^k-142381897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142381597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1452828 + ... + 1452925.

It is an arithmetic number, because the mean of its divisors is an integer number (27604663).

Almost surely, 2^142381897 is an apocalyptic number.

It is an amenable number.

142381897 is a deficient number, since it is larger than the sum of its proper divisors (23246081).

142381897 is an equidigital number, since it uses as much as digits as its factorization.

142381897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905767 (or 2905760 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 142381897 is about 11932.3885706090. The cubic root of 142381897 is about 522.1776246022.

The spelling of 142381897 in words is "one hundred forty-two million, three hundred eighty-one thousand, eight hundred ninety-seven".